+Here a asteroids(game) like simulation. It has a save and load state. It has ai that lets the ship move into a random direction without hitting a asteroid. It saves the state and gives the ship a random angle and thrust value and simulates a x number of steps into the future. If there is no collision then these values are passed into the regular visible onscreen version after the state before the simulation occured.
Rudy Boudewijn van Etten